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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcd316d124f5edb1262af602a9b655ac3d3364ac66d74f6787986bc45e8a0d5' 
  AND token = 'duRHLayGtlcY/r3gwmu7iJqf8nDsmy6GdtwajthKavw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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