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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf934c5dd29ad3852059e005073fbb296302f43e65ad23e11f525cb812a3b95' 
  AND token = '6Q1NnNmX9MzUFU/Ew01RpPS84McsGYrDI8YK/Ls0MvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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