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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28a7e0c751a6672291e8cd4a58e5115730ec301ac02c4a59c74a3a85db3e32e' 
  AND token = 'RwD8kmoot0HceU1d2Cdm/E+/k1HXzFfMBRPZN60aWU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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