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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09eb3fad39ff9a0b8c7b35f770770baab223d25a5159a540234816c779fc913' 
  AND token = 'IJFvPO6OK2Wn79kTF1YgGsnPmqs9ndOe8cbUraR54sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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