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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2389a2df9c01e9b3b75bf2529daaa666cae70b0cab5f83f01f6e5f50dc04b0f1' 
  AND token = '1aCN5f025USmV2JZH9G109UHiPxaYXiqr0ZbMMSyegk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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