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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee62d07d3f43c268a18bf0f312c1b0f405a74c58ca8a0dbcaf1083cf3d19ce5' 
  AND token = '/0SwC8p2enuFALejPNM43qvII9yRzFT+u8wDAuWJt48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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