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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548c6c2807563e9b4ea60c65d4544691a87fb6658185f925ef38b697f4f7b9f6' 
  AND token = 'MnTPrFvW3rTBpYso82OTF0SqdxYQFmfW5q0uyE0om/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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