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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fe34a7b00144bca9905770b32cb245d2c2cf4b7ecb8c8bbe32b919726b4a3d' 
  AND token = 'a6JvHXawQhGN1HER+Ft2AJCUs+B9DrZC5EyEUNhNvfM=' 
  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"
    }
  }
}