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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ea240ba53232832fb1311c9addd42bb1db67e7dc14b760c5116ea5e08ba4ed' 
  AND token = 'eE1yNkXxX8X7fz5g58fypHulPBFfefyte8Vhg1ypSzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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