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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b638f59d39b82e23dc33d38f182d709d2d5626d5edb5d6c0a4e650b038b541c' 
  AND token = 'bCfsogYYfW6NbIr9I5j7h+trphIYeFs6Ju1dc0lxo8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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