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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc807b19ca954ce1c24ac56f50f29c4d98904e3b2dad50047ff79e627b72fbb' 
  AND token = 'PiN5o3yNVgT6/t61gKWSC73KZuJJYgriaKR5PGLo9ME=' 
  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"
    }
  }
}