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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd267c82a29d041ffccd73d37fd1ea328aaad5e626c4074f189759705c9c04259' 
  AND token = 'AD2xOrV59UqW8GFeiB73SD8zHfnw9O7LTOkqZsCGQwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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