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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f614a8401de4c3a84198e70252372caf194bcf142ca01ba053a73e66b4cb4062' 
  AND token = 'oYjDvAQ+hxiraKcyvbv/I1UPgevOU+glDk/hdlv2C6w=' 
  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"
    }
  }
}