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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0ff90c1f4c57ad2dca6b7cee448bf8a3900f0ba49f54289192ed127b5db592' 
  AND token = 'bsJwHboY77Q9RYBMXX9vHeD7tI8JaC7nFRzpV2otWUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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