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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9c9124841f0d5a94569b7759a11161e99875bc5b5ea906a2648586dc874bdc' 
  AND token = '3XDDSyrS+rPrUM4es77ssA1bP8WlYxXvTzCANZ5ITBM=' 
  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"
    }
  }
}