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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad823bee0104a4d184cbe3902f662389b9aebbe20d9198d83ab6e6933b8c9a50' 
  AND token = '2h0owsq8KtCyOvglulk6T02n09tkgnIABmg8aKbyN3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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