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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c1ee0b25bae6b0572e4a9dfce19b442d0b495a78b10f64f7399b7f1654a962' 
  AND token = 'fEY3DLxjhCbhQelGf8/32zfrIYzCXOuM5QUFo6TLblc=' 
  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"
    }
  }
}