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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f2851edaff578700f589f4d2b5a6bd341b284de4d9da8cb7cc804549a436ed' 
  AND token = 'pxthiPhFNCq0S0spRIq/nB2yM9mnyWjXBiwn8fzu2Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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