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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b62149e50a315d9fa31985312101205756422e30843a4f9371222ff3f81cf1e' 
  AND token = '0IQTXwShMf1AlnOMnvn37I5U7Ud3d28Bw4SQAkhba6I=' 
  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"
    }
  }
}