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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47578560ae2d41f54b2f2388498ee8455c4b40d18ba6037ffc924f9050c26e9d' 
  AND token = 'tFUcsOvAs9gmU+OUmbhPpL8jNMe77l55q3PoqwVFalI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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