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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe134844fe2e876430f2650f3000509613ea3b135998c660efbce71f961c487' 
  AND token = 'O2EgXt2RtJKfnFSbGVRbIejM28lp1h2BnJFHcoJEVXg=' 
  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"
    }
  }
}