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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836bc38ba8d5f713721988115e422f17be063b8b51a7ac550e45115e7e745e72' 
  AND token = 'ZFM3NK6uREJKlz+JcAy4M6+amQpierliVfpk7IkMsF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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