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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c961783e727382b37c1e55fd47cfae607adac0fa62a3e1de93693835867d5db' 
  AND token = 'RDvQazQWf7Mwr4dgK7igXDXx7IqWoFVjM8l8GOW/fog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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