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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b3de7bfeee83b757510029038bd3d4b8ecac3929de9e4e108267b2116c62b1' 
  AND token = 'zDysTkCOCHfvuV7SI9VcuTzq9ISl0p46GFyNA9xy99M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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