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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f578154f66f03b8bf369b8dead1acef6bec900f7041c46ffd697d4af46099048' 
  AND token = 's8beiXJ2H/H7wyBDdbIwsDJ6sM4E+kvztR8GgaBYOp4=' 
  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"
    }
  }
}