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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789b2dba9d0df989cb311181e38779f72de7259c49e37754d01d50e0f31464c8' 
  AND token = '6m7fbHynyZ0q4odk0G4s+DM68cBYhcXMEoz65B8OgM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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