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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b73057d7b6e5a2f816b683e7a0200dd4d8d4224820f29ab36b964aec04e7e' 
  AND token = 'v3M0Cp+RtNhr4Pvv6DP3BGdJAO83Xr/dUc8R2ea6z+s=' 
  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"
    }
  }
}