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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3482dc73770f5561b210ae52b8a47203834580e273ee807e4edebe5f176a3e59' 
  AND token = '9s0E4YJe2eXeQvoLrWE9C7RhfgeKH80itdDbwYxF268=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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