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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7795fba0cd07f31d35ac4eaac2a579e98527f66c3d714947455b7f5ff043eb8' 
  AND token = '/b+nM98aJ7m78iuHSdREkur1ihi2+qX9gCT9CHprvNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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