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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f69dbb73b0421e854ebbcc8a5e3430739684f2e9a5c64471a5153c3c022d61' 
  AND token = 'V9zura0RLoZ+gI16gfW6YfDUdCgtoRBn9EDRMAPsjws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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