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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af171078520b9b31dbab1125ef1a7bdaf7bb31f2dce40a3287bb3053d80d82c' 
  AND token = 'NvgL6tB9ohDn0GfRVPy9O59LCzP9RVETSC5hVfKfkzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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