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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ff8c28a9482802930aa4b6e9a0b8acb77a7b89f0b36ee79eccdd376775aba0' 
  AND token = 'O0Tzr+oTPp91KanVZ2V/U7z5UPlfVYAj91fnisruNEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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