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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351b8a76716366a874b4f91e180cbc6ccde24e7924415b4dbbecca01c5b6487e' 
  AND token = 'V7ujqOB1eAjFqv9vRzX0JAOtpBdALOyOO0TTm7F+Cmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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