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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6fe975b9fed9e50ab3b1d1ef84a230684a08eb14091ad646dd05fa8be0bdaf' 
  AND token = 'azcXYluy2qp1KL1N8h8OJ4uaQFNSom0Mxff30BsfXFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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