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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634ec2bc3e225c3060ca0f22a98086d3c11e41d69528c0d1b7ebfb6c9c52d87c' 
  AND token = 'q72kFj+aK+77l0f4P437qcy4m6KKJKaGoQzU72b3htU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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