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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbad5597ee19bca7f7e22c24f328ce1662d24194e1d93a5ba3894c78e97f856' 
  AND token = 'JYA3pwSnq87wKrKyHTr2Di3av7HYXPZD65Rz3tsXDOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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