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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477176a762d4624630b7222a11c89d0f7a2d30f1f477d682cab2b87ea253aeab' 
  AND token = 'zzSX8JwP4xbpLQ/oMzaG9A2PJ+282pE5jybRK/G0zSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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