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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d308fc8da77dbf35497e1f612e01087e5463984babe85867b349f79f1707f5' 
  AND token = 'jUik0exONXM6OdJ0pcUMKm5jRWDnzY5XfSjBxFu+D20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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