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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80eb270dce50688ba70350d6ecf305aa67fec995e5b0cdf54104e890a048335' 
  AND token = 'qkJip+O9RZxL7v7h2pePEN7fWkXhJqAvqX6HjrXuxxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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