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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b5c1db03aa9c6521884c60d0e086d53a395ded3da56d6f29cae402ba32980e' 
  AND token = 'ZVeVmaf23gUKkEHgL1zuYEp+W4iMllbNisiCLd+shII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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