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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee2d956b73b62b7cd5c29b2b7c7931b8f0c232c8abc7ce41be5362234e544c9' 
  AND token = 'cL73PkD5SMYKKY3gDQQDGyczvPA1qgxjsSEJTzQ/E/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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