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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729de2b06d1e4c7e5150e8af56385f3fd20ab6fe5b3b5ed0dc0264d1f66541de' 
  AND token = 'dHv6v2lX4wvZ4AhhM5HNpiE8XcHNTQ+lhC7H9W8AxFk=' 
  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"
    }
  }
}