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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2103e800680ddd658b95b89a8b78ec0c3f04afd29a7b9b073e958b67d8e16cb' 
  AND token = 'eiZMOjNb50moTzZa5GxM0kSpRBGIzzJc29fV0uJ1u8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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