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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecf7fb63c640afb1da703ae98845ba2eef6241220582c497cc1ad9aed5c1667' 
  AND token = 'QTOTNAstCnTOFc4inplkHaa5vKfbYIA4gtMa0GsAjj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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