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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5f48cd6e0e59d1936215b054bb3af81b181db28a68106ec914ecf589f8e39e' 
  AND token = 'lKdw+1jDwNhdIIl66b8rJViclDFrCEktBxBRhWmGe4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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