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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7995d6cd28e79eb585b99d751bc2428c65b278ee2b4c87f11cc18f4ea5751721' 
  AND token = 'WMotnMq9mRITA5phzhg11W5xfwarze7D8w9LSKQj1Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}