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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3230647090ada7c6af8ac6ee6faea21908eaaeb54202560b8040b01308ff5c4' 
  AND token = 'QFol+Fa5/8NvM2YezY8NopNT0ohu+EyLvahPBE7juRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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