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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afc39183c2d8d3d09d66a60915f246e1a73b858b15950537b0abbc03b8753dd' 
  AND token = 'PQC59F9YSLbTn37itdYb3ORiZTu0dwph+cQy6m083yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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