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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769de5dc83c80d07f152585c215b036620e15a8734eef6499ec820925d21e70d' 
  AND token = 'axBjiXk7Mi8AoELDwTyZ3b+cMFIpqBDBRm8M3FHsG7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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