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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64108b8fef16e8445bf6ca92341647dd2aa91e3c9222bdf89ae7afafba5b0dcf' 
  AND token = 'bXX4ULRENN8X+AYiPBkSCUc4X/O9YJKakA1yJZETFH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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