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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cb7186f051ce7a0c22da2b5082ee7018ad4913d58c6d76843e7f0a54d776ca' 
  AND token = 'KO5QxOmmuHxTKQJX9OMXzGe36dCz23rBIJiRlRkdiPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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