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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e216a644e1d9e5ce9b996ba9dfff5122bbb5c174e6f19478ba5ceb7d663df2' 
  AND token = 'F7d4TaO/b0QZ3m+AO4M0DUH08mP48Xaleq6ly9v6VkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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