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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b2988d5d37ec44158b23dabfde5acba6e32636b4b3765142c6231be814d0aa' 
  AND token = '54QSUBrDXk+QdWfV9rsx/6myXEZycLlPngdqNnE5N8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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