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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867e2eff190a6e14da3a279c89e691f640d8b439de81ac130199edbd8f8c2015' 
  AND token = 'YtvoDMiMo2P/nbLh3bHrMPf2Yfn0n+npZiPI+F8nEIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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