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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9984e2c02d1fb113d26d2bf50b4bd95b8248e4ebb6e91ccb6b65c2c0ddee4aa7' 
  AND token = 'P7KHiWUWexgC0y+8YORs9pxga76YODugYo9Xiyeol4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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