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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e582942e1b8ed21da413c371083ae071b9fdf3f2f0fb238c2e4c3fe3ed6e24' 
  AND token = 'z5gpdpHq3M49i2gWTodQeuw4f9b0LpG9o+rEa+Mrr2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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