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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f1f02e75f84bd4bf003e143d1149ab63eb61252d3ee68490567592f6b6aeaa' 
  AND token = '2thMIAenuwjJ924Ga2WVkDqrmI0MFb7nSB9OZcyPuLg=' 
  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"
    }
  }
}